Dewetting and Spreading Transitions for Active Matter on Random Pinning Substrates
arXiv:1608.05323 · doi:10.1063/1.4983344
Abstract
We show that sterically interacting self-propelled disks in the presence of random pinning substrates exhibit transitions among a variety of different states. In particular, from a phase separated cluster state, the disks can spread out and homogeneously cover the substrate in what can be viewed as an example of an active matter wetting transition. We map the location of this transition as a function of activity, disk density, and substrate strength, and we also identify other phases including a cluster state, coexistence between a cluster and a labyrinth wetted phase, and a pinned liquid. These phases can be identified using the cluster size, which dips at the wetting-dewetting transition, and the fraction of sixfold coordinated particles, which drops when dewetting occurs.
5 pages, 5 png figures
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- Active Matter Shepherding and Clustering in Inhomogeneous Environments
- Pattern Formation and Transport for Externally Driven Active Matter on Periodic Substrates
- The influence of obstacles on collective motion of self-propelled objects
- Hydrodynamics of a Granular Gas in a Heterogeneous Environment
- Active wetting transitions induced by rotational noise at solid interfaces
- Wetting transition of active Brownian particles on a thin membrane